http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CA-2053035-C
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_fd93ca6a78fdf378046996109cf6d115 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D21C9-147 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D21C9-1057 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D21C9-153 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D21C9-16 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D21C9-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D21C9-147 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D21C9-10 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D21C9-153 |
| filingDate | 1991-10-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1997-09-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c7d26f2065ca9ee1ea3e8023124d2809 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_853579edcae382108f1a57b2c262fddf http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_96d63fdf890bec43d1a748204d75ffb5 |
| publicationDate | 1997-09-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CA-2053035-C |
| titleOfInvention | Chlorine-free wood pulps and process of making |
| abstract | This invention provides for a batch and continuous process with countercurrent recycle of bleaching filtrates for the delignification and bleaching of pulp. Oxygen delignification of pulp is achieved in excess of from about 50% to about 76% as measured by kappa numbers, while the pulp viscosity is minimally decreased in the range of from about 2 to about 5 cps. Bleaching of delignified pulp is achieved with peroxy compounds and ozone and pulp brightness of from about 82 to 88 ISO can be achieved with pulp containing zero level TOX from chlorine based bleaching chemicals and zero level of AOX in the bleach effluents. Higher brightness of from about 90 to about 92 ISO can also be achieved by addition of very low levels of chlorine based bleaching chemicals. Corresponding bleach effluents contain less than 200 ppm AOX. Bleaching filtrates can be recycled for pulp washing and for use with an organosolv pulping process which results in significant energy savings and mitigation if not elimination of pollution typically associated with chlorine based bleaching. This invention also relates to bleach pulp product derived from the process and to an apparatus for carrying out the process. |
| priorityDate | 1990-10-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 38.